Evidence Against Instanton Dominance of Topological Charge Fluctuations in QCD
The low-lying eigenmodes of the Dirac operator associated with typical gauge field configurations in QCD encode, among other low-energy properties, the physics behind the solution to the U{sub A}(1) problem (i.e. the origin of the {eta}{prime} mass), the nature of spontaneous chiral symmetry breaking, and the physics of string-breaking, quark-antiquark pair production, and the OZI rule. Moreover, the space-time chiral structure of these eigenmodes reflects the space-time topological structure of the underlying gauge field. We present evidence from lattice QCD on the local chiral structure of low Dirac eigenmodes leading to the conclusion that topological charge fluctuations of the QCD vacuum are not instanton-dominated. The result supports Witten's arguments that topological charge is produced by confinement-related gauge fluctuations rather than instantons.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 775027
- Report Number(s):
- JLAB-THY-01-05; DOE/ER/40150-1809; hep-lat/0102003; TRN: US0200921
- Journal Information:
- Physical Review, Vol. D, Issue 65; Other Information: No journal information given for this preprint; PBD: 7 Feb 2001; PBD: 7 Feb 2001
- Country of Publication:
- United States
- Language:
- English
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